Super-charger for internal combustion engines



March 26, 1935. E. s. MARKS Er AL 395,935

SUPERCHARGER FOR INTERNAL COMBUSTION ENGINES Filed April 1, 1932 2 Sheets-Sheet 1 A TTORNEYSQ March 26 19350 E. s, MARKS ET AL 1,995,935

SU PE RCHARG'ER FOR INTERNAL COMBUSTION ENGINES Filed. April 1, 1952 2 Sheets-Sheet 2 INVENTORS.

i a/Md I ATTORNEYS.

Patented Mar. 26, 1935 j 1,995,935

= UNITED STATES PATENT oFF'lcE SUPER-CHARGER FOR INTERNAL COMBUSTION ENGINES Edward 8. Marks and Carl T. Doman, Syracuse,

N. Y., assignors to Franklin Development Corgoraktion, Syracuse, N. Y., a corporation of New Application April 1, 1932, Serial No. 602,484

1 Claim. (Cl. 123-119) This invention relates to internal combustion system of the air cooled combustion engine of the engines having a carburetor, or other fuel form- Franklin type, where the cooling air current is ing, or vaporizing means, in which the explosive blown from one side of the bank of cylinders charge is formed by mixing it with air, and has around and between the cylinders and the heads for its object, a particularly simple and eflicient thereof, to the other side of the bank. 5

means for forcing, or super-charging, air through 1 designates the base; 2 the cylinders of the air the air intake of the carburetor. cooled internal combustion engine; 3 a centrifu- Another object, is the means for efliciently utigal fan rotor, or blower, usually mounted on the lizing the air circulating fan of the internal comfront end of the crank shaft of the engine; and

i0 bustion engine for super-charging the air to the 4 a scroll casing surrounding the rotor, or fan,

carburetor. and having an air intake 5 at its front side, and

Another object, is means for utilizing the air a peripheral air outlet 6 directed rearwardly. cooling current of an air cooled engine for sup- 7 designates an air conduit connected to the plying the air current to the carburetor, or the outlet 6 of the casing and arranged to discharge l5 connecting of the air intake of the carburetor in air, as indicated by the arrows, crosswise of the the air cooling circulating system. cylinders and the heads thereof from one side Other objects appear throughout the speciflof the bank of cylinders to the other. cation. 8 designates the carburetor, or other fuel form- The invention consists in the novel features ing, or vaporizing device, the term "carburetor and in the combinations and constructions herebeing used merely for convenience, and not in 20 inafter set forth and claimed. the sense that it strictly speaking carburizes air,

In describing this invention, reference is had or utilizes a hydro-carbon. The carburetor is,

to the accompanying drawings in which like charwith the exception of the modifications hereinacters designate c rresp ndi parts in l the after pointed out, of the usual construction, and 85 views. that here shown is of the Stromberg type. It in- Figure 1 is a horizontal, sectional view of an cludes the usual fuel supply chamber, or float air cooled engine provided with my invention. chamber 9, main air intake 10, mixing chamber ur 2 is an nlar d. sec ional-v ew on lin and outlet 11 having the usual butterfly or throt- 22,- Figure 1. tie valve 12 therein operated in the usual man- Figure 3 is an enlarged elevation, partlyin secner, and an atomizing nozzle 13 interposed be- 30 tiOh, f Carburetor nd e c n u D tween the air intake and the mixing chamber. tion of the super-charging conduit. The nozzle is connected to the lower part of the We have her shown ur inv n a applied float chamber through the usual duct 14, and the to a multi-cylinder air cooled engine "in which float chamber is connected to a main source of the air is discharged by a a u ted by the ensupply through a conduit 15. Carburetors of this 35 s v r, 01 ar und, he ylihd rs, and in h type are usually provided with an equalizing duct engine illu at d. the air is sc ged laterally between the upper part of the float chamber and across and between the cylinders and, the heads the znixing chamber. This equalizing passage is thereof from one side of the bank of cylinders to dispensed with, or plugged up. The carburetor the other. also has the usual passage connecting the duet The invention comprises lly, a conduit 14 and the outlet of the carburetor above the arranged to receive p Of the air current 8- throttle valve for supplying fuel to the engine for t d y t fan o the e, Whether Wate idling the engine when the throttle valveisclosed. d, a ed, and connected to the air 16 designates a conduit for air under pressure intake of the carburetor. It further includes an and connected to the air intake 10 of the car- 45 air condu t cfl cted o e upp y Chamber for buretor, this conduit 16 being connected to a suitthe ar ur t r. as h fl chamber, r h able source of supply of air under pressure, it which air passes under the same pressure as the b ing here shown as connected iii the air cooling air in the conduit connected to the air intake of system of the engine. The conduit 16includes a the carburetor in order to maintain the same casing 17 in which an air screen or filter 18 is pr p t a a d tiv flu d, r a line, located, this screen being shown as made upof under all conditions, as variations in the presinner and outer cylinders of wire mesh with a sure. a filtering material between them, the outer cylin- In the engine here illustrated, the air intake of der being spaced apart from the walls of the casthe carburetor is connected in the air cooling ing toprovide a passage for the air around the fllterso that-theaircanenterthe filter throughout the circumference thereof. The inner passage 19of thefllterisalinedwlththe mainair intake .10 of the carburetor.

Preferably, the casing 17 receives the air currentdirect fromthefancasing4,andforthis purpose communicates. with a conduit 20 having its receivingend 21 arranged in juxtaposition to the fan outlet 6. This conduit 20 is of comparatively large area and of the fullheight of the outlet 6, but of less width than the same. Preferably, the conduit 20 is located within the air conduit 7 and extends along the outer wall thereof. The conduit 20 opens into the casing 17 through a e 22, and the casing 17 is formed with a 23 to the outer air, which e is normally closed by a valve 24, this valve being operable to open the e 23 and close the passage 22 so that normally the air is supercharged through the carburetor, but if at any time it is desirable to dispense with the supercharging, the valve can be operated to close thepassage 22 air.

The conduit 20 preferably communicates directlywith the fan housing in order to conduct cold-air to the carburetor so that the supercharging effect will be increased by the expansion of the air when being warmed in any one of the usual ways after through the carburetor,

and open the passage 23 to the outer but at times it may be desirable to pass warm air through the carburetor and for this purpose, the

valve 24 is provided in order that the warmer air under the hood which encloses the engine may be taken into the carburetor. Preferably, the

1',oas,ess

supply chamber to: the firm of the carburetor is under approximately the same pressure as the supercharged air through the main air intake, thissupplychamberbeing,inthisinstance,the float chamber of the carburetor. As here illustrated, the air conduit, which supplies air to the airintakeofthecarburetor,isconnectedbya pipe or by-pass'25 to the upper part of the float chamber 9 above the float 26 therein.

In the normal operation, the air is blown by the fan 3, through the conduit 20 to the casing 17 whence it through the air intake 10 of the carburetor past the nozzle 13 and throttle, valve, when open, into the engine cylinders, thus forcing an explosive mixture into the cylinders. At the same time, air under pressure passes through the 'by-pass 25 to the float chamber, so

that the mixture formed at the nozzle is practically the same under all conditions. when it is desired to run the engine, without su'percharg'ing, the valve 24 is operated by any suitable means to close the e 22 and open the e 23.

What we claim is:

The combination with an air cooled engine, an air cooling system therefor including a fan actuated bythe engine, acasingiorthefan, anda conduit connected to the casing and arranged to discharge air around the cylinders and being separable from the cylinders and the casing, and

a carburetor for the engine having an air intake, of a conduit connecting the air intake to the fan casing and located in the former conduit and removable as,a unit therewith.

EDWARD S. 'MARKS.

CARL 'I'. DOMAN. 

